feat(API-11): Route API calls through AgilitonAPI gateway

Add gateway-first pattern: when AGILITON_API_KEY is set, route all
external API calls through the gateway with X-API-Key auth. Falls back
to direct API access when gateway is unavailable.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

node_modules/eventsource-parser/dist/stream.js

@@ -0,0 +1,29 @@
+import { createParser } from "./index.js";
+import { ParseError } from "./index.js";
+class EventSourceParserStream extends TransformStream {
+  constructor({ onError, onRetry, onComment } = {}) {
+    let parser;
+    super({
+      start(controller) {
+        parser = createParser({
+          onEvent: (event) => {
+            controller.enqueue(event);
+          },
+          onError(error) {
+            onError === "terminate" ? controller.error(error) : typeof onError == "function" && onError(error);
+          },
+          onRetry,
+          onComment
+        });
+      },
+      transform(chunk) {
+        parser.feed(chunk);
+      }
+    });
+  }
+}
+export {
+  EventSourceParserStream,
+  ParseError
+};
+//# sourceMappingURL=stream.js.map